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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: : RE: list command |

Date |
Mon, 4 Aug 2008 18:18:26 +0100 |

No (I think). (That is, I think I know what I am doing; I just don't understand what you are saying.) If you want an explanation of the code to what now appears to be your problem, see How do I list observations in a group that differ on a variable? http://www.stata.com/support/faqs/data/diff.html Your original question was "2 or more". I understand that "more than 1" is equivalent to "2 or more". That being so, you need not and should not change my code. Nick n.j.cox@durham.ac.uk Daniel Sepulveda-Adams The number 1 in this sentence represent that Stata will list all ndc that have more than 1 gpi, included 1; therefore if I change the number by 2 will be what I want. bysort ndc (gpi) : list if gpi[1] != gpi[_N] Nick Cox It may be that you want to -list- -ndc- for which there are two or more distinct -gpi-. If that is so, -findit distinct-, or bysort ndc (gpi) : list if gpi[1] != gpi[_N] Daniel Sepulveda-Adams OK here is an example of what happened in the dataset, this dataset is a drugs description, therefore codes are associated to names and strength the drug and packages size, etc. Ex: 1) ndc (National Drug Code) assigned one gpi (Generic Product Identifier) ndc: 49502007412 gpi: 44100010102005 2) ndc that has more than one gpi (9 in this specific case, why because each gpi represent a different packages size) Ndc: 00904161260 gpi: 44300040007440 Steven Samuels Daniel, Show us simple examples of data where an observation on 'ndc' 1) does 2) does not "have two or more gpi". It seems that by the phrase "two or more gpi" you do NOT mean "gpi = 2" On Aug 4, 2008, at 11:22 AM, Daniel Sepulveda-Adams wrote: > I have a question about list command; this is what I'm doing: > > list ndc old_ndc e49_ gpi g64_ if gpi>"2" > > gpi is a str variable (it is a 14 digit code) & I know is wrong but > I can > not figure it out how I can ask the program give me all ndc that > has 2 or > more gpi.Thanks * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: list command***From:*"Daniel Sepulveda-Adams" <sepul003@umn.edu>

**st: RE: list command***From:*"Martin Weiss" <martin.weiss@uni-tuebingen.de>

**st: RE: RE: list command***From:*"Daniel Sepulveda-Adams" <sepul003@umn.edu>

**Re: st: : RE: list command***From:*Steven Samuels <sjhsamuels@earthlink.net>

**RE: st: : RE: list command***From:*"Daniel Sepulveda-Adams" <sepul003@umn.edu>

**RE: st: : RE: list command***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**RE: st: : RE: list command***From:*"Daniel Sepulveda-Adams" <sepul003@umn.edu>

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